Senior Software Engineer, Firefox Security is open at Mozilla (Remote Sweden). The posting gives a salary of SEK 513K - SEK 684K. Posted on Oct 14, 2026, and still on Mozilla’s careers page when we last checked, on Nov 14, 2026.
About the role
Design, build and implement security and hardening features for enterprise users: Design, implement, test, and ship cutting-edge security features that strengthen Firefox’s security posture. Advance Firefox’s security architecture across multiple operating systems: Contribute to and drive cutting-edge improvements to Firefox’s core security posture, by building privilege isolation and moving trust boundaries or…
The opening lines of the posting. The rest is on Mozilla’s careers page.
Hiring at Mozilla
Mozilla has 121 open roles right now, 121 of them remote. Most are in Engineering, Security and Sales & Business Development. The median advertised salary across its roles with a published range is $178K. See all its roles